Error message appeared in Resilio AE v4.2.0 as part of the introduction of Storage tiering and Archival job. This job is designed specifically to interact with AWS S3 Glacier storage classes and handle retrieval of archived objects.
This error occurs for other types of jobs when the source directory points to an S3 bucket containing objects stored in Glacier or similar storage classes that require retrieval before access. In such cases, affected objects will either fail to transfer or be skipped, depending on the Skip file errors setting in the Job profile.
To properly handle these objects, use a Storage Tiering and Archival job, which is designed to support retrieval from Glacier-class storage.
Error code SE_UNSUPPORTED_STORAGE_CLASS